[PATCH 08/15] dma-mapping: move dma_get_required_mask to kernel/dma

[Christoph Hellwig]

dma_get_required_mask should really be with the rest of the DMA mapping
implementation instead of in drivers/base as a lone outlier.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 drivers/base/platform.c | 31 -------------------------------
 kernel/dma/mapping.c    | 34 +++++++++++++++++++++++++++++++++-
 2 files changed, 33 insertions(+), 32 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 41b91af95afb..eae841935a45 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1179,37 +1179,6 @@ int __init platform_bus_init(void)
        return error;
 }
 
-#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
-static u64 dma_default_get_required_mask(struct device *dev)
-{
-       u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
-       u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
-       u64 mask;
-
-       if (!high_totalram) {
-               /* convert to mask just covering totalram */
-               low_totalram = (1 << (fls(low_totalram) - 1));
-               low_totalram += low_totalram - 1;
-               mask = low_totalram;
-       } else {
-               high_totalram = (1 << (fls(high_totalram) - 1));
-               high_totalram += high_totalram - 1;
-               mask = (((u64)high_totalram) << 32) + 0xffffffff;
-       }
-       return mask;
-}
-
-u64 dma_get_required_mask(struct device *dev)
-{
-       const struct dma_map_ops *ops = get_dma_ops(dev);
-
-       if (ops->get_required_mask)
-               return ops->get_required_mask(dev);
-       return dma_default_get_required_mask(dev);
-}
-EXPORT_SYMBOL_GPL(dma_get_required_mask);
-#endif
-
 static __initdata LIST_HEAD(early_platform_driver_list);
 static __initdata LIST_HEAD(early_platform_device_list);
 
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index dfbc3deb95cd..dfe29d18dba1 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -5,7 +5,7 @@
  * Copyright (c) 2006  SUSE Linux Products GmbH
  * Copyright (c) 2006  Tejun Heo <te...@suse.de>
  */
-
+#include <linux/memblock.h> /* for max_pfn */
 #include <linux/acpi.h>
 #include <linux/dma-noncoherent.h>
 #include <linux/export.h>
@@ -262,3 +262,35 @@ int dma_common_mmap(struct device *dev, struct 
vm_area_struct *vma,
 #endif /* !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */
 }
 EXPORT_SYMBOL(dma_common_mmap);
+
+#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
+static u64 dma_default_get_required_mask(struct device *dev)
+{
+       u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
+       u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
+       u64 mask;
+
+       if (!high_totalram) {
+               /* convert to mask just covering totalram */
+               low_totalram = (1 << (fls(low_totalram) - 1));
+               low_totalram += low_totalram - 1;
+               mask = low_totalram;
+       } else {
+               high_totalram = (1 << (fls(high_totalram) - 1));
+               high_totalram += high_totalram - 1;
+               mask = (((u64)high_totalram) << 32) + 0xffffffff;
+       }
+       return mask;
+}
+
+u64 dma_get_required_mask(struct device *dev)
+{
+       const struct dma_map_ops *ops = get_dma_ops(dev);
+
+       if (ops->get_required_mask)
+               return ops->get_required_mask(dev);
+       return dma_default_get_required_mask(dev);
+}
+EXPORT_SYMBOL_GPL(dma_get_required_mask);
+#endif
+
-- 
2.19.1